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Steel water and gas pipes. Steel water and gas pipes Water and gas pipes GOST 3262 85

This standard applies to non-galvanized and galvanized steel welded pipes with sliced or rolled cylindrical thread and without thread, used for water and gas pipelines, heating systems, as well as for parts of water and gas pipeline structures.

Designation:	GOST 3262-75*
Russian name:	Steel water and gas pipes. Specifications
Status:	active
Replaces:	GOST 3262-62
Date of text update:	01.10.2008
Date added to the database:	01.02.2009
Effective date:	01.01.1977
Designed by:	Ministry of Ferrous Metallurgy of the USSR
Approved:	USSR State Committee for Standards (09/11/1975)
Published:	Publishing house of standards No. 1994

STEEL WATER AND GAS PIPES

TECHNICAL CONDITIONS

GOST 3262-75

PUBLISHING HOUSE OF STANDARDS

Moscow

STATE STANDARD OF THE USSR UNION

dateintroduction 01.01.77

This standard applies to non-galvanized and galvanized steel welded pipes with cut or rolled cylindrical threads and without threads, used for water and gas pipelines, heating systems, as well as for parts of water and gas pipeline structures.

1. ASSORTMENT

1.1. Pipes are manufactured according to the dimensions and weight given in table. 1.

At customer's request light pipes series intended for thread rolling are manufactured according to the dimensions and weight given in table. 2.

(Changed edition, Rev. No. 1 , 3 ).

1.2. The length of the pipe is made from 4 to 12 m:

measured or multiple measured length with an allowance for each cut of 5 mm and a maximum deviation for the entire length plus 10 mm;

of unmeasured length.

By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of unmeasured pipes.

Table 1

Dimensions, mm

Conditional pass	Outside diameter	Pipe wall thickness			Weight of 1 m of pipes, kg
Conditional pass	Outside diameter		ordinary	reinforced		ordinary	reinforced

table 2

Dimensions, mm

Conditional pass	Outside diameter	Wall thickness	Weight of 1 m of pipes, kg

Notes:

1. For threads made by rolling on a pipe, its internal diameter is allowed to be reduced by up to 10% along the entire length of the thread.

2. The weight of 1 m of pipes is calculated at a steel density of 7.85 g/cm 3. Galvanized pipes are 3% heavier than non-galvanized ones.

1.3. Maximum deviations in pipe sizes should not exceed those indicated in the table. 3.

Table 3

Pipe sizes	Limit deviations for manufacturing precision pipes
		increased
Outer diameter with conditional passage:
up to 40 mm incl.
	- 0,5
Outer diameter with nominal bore: over 40 mm
	- 1,0
Wall thickness	- 15 %	- 10 %

Notes:

1. The maximum deviation to the positive side in terms of wall thickness is limited by the maximum deviations in the weight of the pipes.

2. Pipes of standard manufacturing precision are used for water supply, gas pipelines and heating systems. Pipes with increased manufacturing precision are used for parts of water and gas pipeline structures.

1.4. Maximum deviations in the mass of pipes should not exceed +8%.

At the request of the consumer, the maximum mass deviations should not exceed:

7.5% - for the party;

10% - for a separate pipe.

(Changed edition, Amendment No. 2, 5).

1.5. The curvature of pipes per 1 m of length should not exceed:

2 mm - with nominal bore up to 20 mm inclusive;

1.5 mm - with a nominal bore of more than 20 mm.

1.6. Pipe threads can be long or short. The thread requirements must correspond to those indicated in the table. 4.

Table4

Conditional bore, mm	Thread length before run-out, mm		Conditional bore, mm	Number of threads at nominal size	Thread length before run-out, mm
Conditional bore, mm		short	Conditional bore, mm	Number of threads at nominal size		short

1.7. Pipes with a nominal diameter of 6, 8, 10, 15 and 20 mm are wound into coils at the consumer’s request.

Examples of symbols

An ordinary pipe, non-galvanized, of normal manufacturing precision, of unmeasured length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without threads and without a coupling:

Pipe 20´ 2.8 GOST 3262-75

The same with the coupling:

Pipe M-20´ 2.8 GOST 3262-75

The same, measured length, thread:

Pipe R-20´ 2.8 - 4000 GOST 3262-75

The same, with zinc coating, of unmeasured length, with thread:

Pipe Ts-R-20´ 2.8 GOST 3262-75

The same, with zinc coating, measured length, with thread:

Pipe Ts-R-20´ 2.8 - 4000 GOST 3262-75

For pipes with rolling threads symbol After the word “pipe” the letter N is indicated.

For pipes with long threads, the letter D is indicated after the word “pipe” in the symbol.

For pipes with increased manufacturing precision in the symbol after the size conditional passage the letter P is indicated.

(Changed edition, Amendment No. 1).

2. TECHNICAL REQUIREMENTS

2.1. Pipes are manufactured in accordance with the requirements of this standard and according to technological regulations approved in in the prescribed manner, made of steel according to GOST380 and GOST1050 without standardization mechanical properties and chemical composition.

Pipes for parts of water and gas pipeline structures are made of steel in accordance with GOST 1050.

2.2. At the request of the consumer, the ends of pipes to be welded, with a wall thickness of 5 mm or more, must be chamfered at an angle of 35-40 ° to the end of the pipe. In this case, an end ring 1 - 3 mm wide should be left.

At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, threads are applied to both ends of the pipe.

2.1; 2.2. (Changed edition, Amendment No. 3, 4).

2.3. At the request of the consumer, pipes are equipped with couplings manufactured in accordance with GOST8944, GOST8954, GOST8965 and GOST8966 at the rate of one coupling for each pipe.

(Changed edition, Amendment No. 3).

2.4. Cracks, spots, swellings and declines are not allowed on the surface of the pipes.

Delaminations are not allowed at the ends of the pipes.

Individual dents, ripples, scratches, traces of stripping and other defects caused by the production method are allowed, if they do not take the wall thickness beyond the minimum dimensions, as well as a layer of scale that does not interfere with inspection.

On pipes manufactured by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the seam if there is a gentle thickening in this place along internal diameter no more than 1.0 mm.

(Changed edition, Amendment No. 3, 4).

2.5. At the request of the consumer, on pipes with a nominal bore of 20 mm or more, the burr on the inner surface of the pipe seam must be cut off or flattened, and the height of the burr or its traces should not exceed 0.5 mm.

At the request of the consumer, on pipes with a nominal bore of more than 15 mm, manufactured by furnace welding and hot reduction, a gentle thickening with a height of no more than 0.5 mm is allowed on the inner surface of the pipes in the weld zone.

(Changed edition, Amendment No. 2, 3, 4, 5, 6).

2.6. The ends of the pipes must be cut at right angles. The allowed end bevel value is no more than 2 ° .The remaining burrs should not exceed 0.5 mm. When removing burrs, blunting (rounding) of the ends is allowed. It is allowed to cut pipes in the mill line.

By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, manufactured by furnace welding.

(Changed edition, Amendment No. 4, 6).

2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of pipes is allowed.

On the surface of galvanized pipes, bubbles and foreign inclusions (hartzinc, oxides, sintered mixture), and peeling of the coating from the base metal are not allowed.

Individual flux stains and traces of pipes being caught by lifting devices, roughness and minor local deposits of zinc are allowed.

It is allowed to correct individual non-galvanized areas on 0.5% of the outer surface of the pipe in accordance with GOST 9.307.

(Changed edition, Amendment No. 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf/cm 2) - pipes, ordinary and light;

3.1 MPa (32 kgf/cm 2) - reinforced pipes.

At the consumer's request, the pipes must withstand hydraulic pressure of 4.9 MPa (50 kgf/cm2)

2.9. Pipes with a nominal bore of up to 40 mm inclusive must withstand the bend test around a mandrel with a radius equal to 2.5 times the outer diameter, and with a nominal bore of 50 mm -on a mandrel radius equal to 3.5 outer diameter.

At the consumer's request, pipes must withstand the distribution test:

for pipes with a nominal bore from 15 to 50 mm - no less than 7%;

for pipes with a nominal bore of 65 or more - no less than 4%.

At the consumer's request, pipes must withstand the flattening test to a distance between the flattened surfaces equal to 2/3 of the outer diameter of the pipes.

2.8,2.9. (Changed edition, Amendment No. 2, 3, 5).

2.10. At the request of the consumer, the mechanical properties of pipes for parts of water supply and gas structures must comply with GOST 1050.

2.11. Pipe threads must be clean, without flaws or burrs and comply with GOST 6357, accuracy class B.

Pipes with cylindrical threads are used when assembling with seals.

2.10; 2.11. (Changed edition, Amendment No. 3, 4).

2.12. Blackness on the threads is allowed in the place of shwad if the reduction in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.

Threads with torn (for cut) or incomplete (for rolled) threads are allowed on threads, provided that their total length does not exceed 10% of the required thread length, and at the request of the consumer does not exceed 5%.

2.13. For threads, it is allowed to reduce the useful length of the thread (without run-out) by up to 15% compared to that specified in, and at the request of the consumer up to 10%.

2.12.,2.13. (Changed edition, Amendment No. 2, 3, 5).

2.14. Threading of galvanized pipes is carried out after galvanizing.

2.15. (Deleted, Amendment No. 3).

2.16. At the request of the consumer, pipe welds are subjected to testing using non-destructive methods.

(Changed edition, Amendment No. 5).

3. ACCEPTANCE RULES

3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, the same brand and be accompanied by one quality document in accordance with GOST 10692 with the addition for pipes intended for the manufacture of parts for water and gas structures, made of steel according to GOST1050: chemical composition and mechanical properties of steel in accordance with the document on the quality of the workpiece manufacturer.

The batch weight is no more than 60 tons.

(Changed edition, Amendment No. 3, 4).

3.2. Each batch of pipes is subjected to inspection of the surface, dimensions and curvature.

Allowed to use statistical methods control according to GOST 18242 with a normal level. Control plans are established by agreement between the manufacturer and the consumer.

Inspection of the outer diameter of pipes is carried out at a distance of at least 15 mm from the end of the pipe.

(Changed edition, Amendment No. 3, 4, 5).

3.3. To control the parameters of the thread, to test for expansion, flattening, bending, the height of the internal burr, the remains of burrs, the right angle and the chamfer angle (for pipes with beveled edges), mechanical properties, no more than 1%, but not less than two pipes from the batch, are selected, and for pipes manufactured by continuous furnace welding - two pipes per batch.

(Changed edition, Amendment No. 3, 4).

3.4. All pipes are subject to weight control.

(Changed edition, Amendment No. 3).

3.5. Each pipe is subjected to hydraulic pressure testing. With 100% quality control of the weld using non-destructive methods, hydraulic pressure testing may not be carried out. At the same time, the ability of the pipes to withstand the test hydraulic pressure is guaranteed.

(Changed edition, Amendment No. 6).

3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes from the batch are selected.

(Changed edition, Amendment No. 2).

3.7. If unsatisfactory test results are obtained for at least one of the indicators, a repeat test is carried out on a double sample.

The results of repeated tests apply to the entire batch.

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

The tensile test is carried out in accordance with GOST 10006. Instead of the tensile test, it is allowed to control the mechanical properties by non-destructive methods.

4.2. Inspection of the pipe surface is carried out visually.

4.3. Hydraulic testing is carried out in accordance with GOST 3845 with exposure to test pressure for at least 5 s.

4.4. The bend test is carried out according to GOST 3728. Galvanized pipes are tested before coating.

(Changed edition, Amendment No. 3).

4.4a. The expansion test is carried out according to GOST 8694 on a conical mandrel with a taper angle of 6 ° .

It is allowed to test on a mandrel with a taper angle of 30 ° .

(Changed edition, Amendment No. 3, 4).

4.4b. The flattening test is carried out according to GOST 8695.

(Changed edition, Amendment No. 3).

4.4v. Weld inspection is carried out using non-destructive methods according to regulatory and technical documentation.

(Introduced additionally, Amendment No. 3).

4.5. The thickness of the zinc coating on the outer surface and in accessible places on the inner surface is controlled in accordance with GOST 9.301 and GOST 9.302, as well as with instruments of the MT-41NTs, MTZON or “Impulse” type according to the regulatory and technical documentation.

4.6. The thread is checked using thread ring gauges in accordance with GOST 2533 (third accuracy class).

In this case, the screwability of the non-go-through ring gauge onto the thread should be no more than three turns.

(Changed edition, Amendment No. 3, 4).

4.7. The curvature of the pipes is controlled using a straight edge in accordance with GOST 8026 and a set of feelers according to ND.

(Changed edition, Amendment No. 3, 5).

4.8. The right angle of the pipe ends is controlled with a 90 square ° size 160´ 100 mm class 3 GOST 3749, plate probes set 4 according to ND or inclinometer GOST 5378. The bevel angle is controlled with a protractor according to GOST 5378.

(Changed edition, Amendment No. 3, 6).

4.9. The outer diameter is checked using smooth micrometers in accordance with GOST 6507, clamp gauges in accordance with GOST 2216 or GOST 18360.

The wall thickness, the height of the internal burr and the height of the burrs are measured with a micrometer according to GOST 6507-90 or a wall gauge according to GOST 11358 from both ends of the pipe.

The length of the pipes is measured with a tape measure according to GOST 7502. The threads are controlled with gauges according to GOST 2533.

The mass of a batch of pipes is controlled on scales of no more than 10 tons with a division value of no more than 20 kg.

(Changed edition, Amendment No. 3, 4, 5, 6).

4.10. Weld inspection is carried out using non-destructive methods according to technical documentation.

(Introduced additionally, Amendment No. 4).

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Labeling, packaging, transportation and storage are carried out in accordance with GOST 10692 with an addition.

5.1.1. Pipe threads must be protected from mechanical damage and corrosion with lubricant according to regulatory and technical documentation.

Sec. 5. (Changed edition, Amendment No. 3).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Ferrous Metallurgy

DEVELOPERS

V. I. Struzhok, Ph.D. tech. sciences, V. M. Vorona, Ph.D. tech. sciences, Yu. M. Mironov, Ph.D. tech. nook, A. I. Postolova

2. APPROVED AND PUSHED INTO EFFECT by Resolution of the USSR State Committee for Standards of September 11, 1975 No. 2379

3. Inspection frequency 5 years

4. INSTEAD GOST3262-62

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

	Item number
GOST 9.301-86
GOST 9.302-88
GOST 9.307-89
GOST 380- 94
GOST 1050-88
GOST 2216-84
GOST 2533-88
GOST 3728-78
GOST 3749-77
GOST 3845-75
GOST 5378-88
GOST 6357-81
GOST 6507-90
GOST 7502-89
GOST 8026-92
GOST 8694-75
GOST 8695-75
GOST 8944-75
GOST 8954-75
GOST 8965-75
GOST 8966-75
GOST 10006-80
GOST 10692-80
GOST 11358-89
GOST 18242-72
GOST 18360 -9 3

6. Validity restrictions were removed by Gosstandart Decree dated November 12, 1991 No. 1726

7. Reissue with Amendments No. 1, 2, 3, 4, 5, 6, approved in November 1977, December 1978, January 1987, May 1988, November 1989, November 1991 (IUS 1 -78.2-79, 4-87, 8-88, 2-90, 2-92)

STEEL WATER AND GAS PIPES
GOST 3262-75

Specifications

Water-supply and gas-supply Specifications

Date of introduction: 01.01.77

1. ASSORTMENT

1.1. Pipes are manufactured according to the dimensions and weight given in table. 1.

At the consumer's request, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in Table 2.

1.2. The length of the pipe is made from 4 to 12 m:

a) measured or multiple measured length with an allowance for each cut of 5 mm and a maximum deviation for the entire length plus 10 mm;

b) of unmeasured length.

By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of unmeasured pipes.

Table 1

Conditional pass	Outside diameter	Pipe wall thickness			Weight of 1 m of pipes, kg
Conditional pass	Outside diameter	lungs	ordinary	reinforced	lungs	ordinary	reinforced
6	10,2	1,8	2,0	2,5	0,37	0,40	0,47
8	13,5	2,0	2,2	2,8	0,57	0,61	0,74
10	17,0	2,0	2,2	2,8	0,74	0,80	0,98
15	21,3	2,35	-	-	1,10	-	-
15	21,3	2,5	2,8	3,2	1,16	1,28	1,43
20	26,8	2,35	-	-	1,42	-	-
20	26,8	2,5	2,8	3,2	1,5	1,66	1,86
25	33,5	2,8	3,2	4,0	2,12	2,39	2,91
32	42,3	2,8	3,2	4,0	2,73	3,09	3,78
40	48,0	3,0	3,5	4,0	3,33	3,84	4,34
50	60,0	3,0	3,5	4,5	4,22	4,88	6,16
65	75,5	3,2	4,0	4,5	5,71	7,05	7,88
80	88,5	3,5	4,0	4,5	7,34	8,34	9,32
90	101,3	3,5	4,0	4,5	8,44	9,60	10,74
100	114,0	4,0	4,5	5,0	10,85	12,15	13,44
125	140,0	4,0	4,5	5,5	13,42	15,04	18,24
150	165,0	4,0	4,5	5,5	15,88	17,81	21,63

table 2

Notes:

1. For threads made by rolling on a pipe, its internal diameter is allowed to be reduced by up to 10% along the entire length of the thread.

2. The mass of 1 m of pipes is calculated at a steel density of 7.85 g/cm 3 . Galvanized pipes are 3% heavier than non-galvanized ones.

(Changed edition, Amendment No. 1, 3)

1.3. Maximum deviations in pipe sizes should not exceed those indicated in the table. 3.

Table 3

Notes:

1. The maximum deviation in the positive direction for wall thickness is limited by the maximum deviations for the mass of the pipes.

1.4. Maximum deviations in the mass of pipes should not exceed + 8%.

At the request of the consumer, maximum deviations in mass should not exceed:

7.5% - for the party;

10% - for a separate pipe.

(Changed edition, Amendment No. 2, 5).

1.5. The curvature of pipes per 1 m length should not exceed:

2 mm - with nominal bore up to 20 mm inclusive;

1.5 mm - with a nominal bore over 20 mm.

1.6. Pipe threads can be long or short. The thread requirements must correspond to those indicated in the table. 4.

Table 4

Conditional bore, mm	Number of threads at nominal size	Thread length before run-out, mm
Conditional bore, mm	Number of threads at nominal size	long	short
6	-	-	-
8	-	-	-
10	-	-	-
15	14	14	9,0
20	14	16	10,5
25	11	18	11,0
32	11	20	13,0
40	11	22	15,0
50	11	24	17,0
65	11	27	19,5
80	11	30	22,0
90	11	33	26,0
100	11	36	30,0
125	11	38	33,0
150	11	42	36,0

1.7. Pipes with a nominal bore of 6, 8, 10, 15 and 20 mm are wound into coils at the consumer’s request.

Examples of symbols

An ordinary pipe, non-galvanized, of normal manufacturing precision, of unmeasured length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without threads and without a coupling:

Pipe 20×2.8 GOST 3262-75

The same with the coupling:

Pipe M-20×2.8 GOST 3262-75

The same, measured length, with thread:

Pipe R-20×2.8 - 4000 GOST 3262-75

The same, with zinc coating, of unmeasured length, with thread:

Pipe Ts-R-20×2.8 GOST 3262-75

The same, with zinc coating, custom length, with thread:

Pipe Ts-R-20×2.8 - 4000 GOST 3262-75

For pipes for rolling threads, the letter N is indicated in the symbol after the word “pipe”.

For pipes with long threads, the letter D is indicated after the word “pipe” in the symbol.

For pipes with increased manufacturing precision, the letter P is indicated in the symbol after the size of the nominal bore.

(Changed edition, Amendment No. 1).

2. TECHNICAL REQUIREMENTS

2.1. Pipes are manufactured in accordance with the requirements of this standard and according to technological regulations, approved in the prescribed manner, from steels with and without standardization of mechanical properties and chemical composition.

Pipes for parts of water supply and gas pipeline structures are made from steel according to.

2.2. At the request of the consumer, the ends of pipes to be welded, with a wall thickness of 5 mm or more, must be chamfered at an angle of 35-40° to the end of the pipe. In this case, an end ring 1 - 3 mm wide should be left.

At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, threads are applied to both ends of the pipe.

2.1; 2.2. (Changed edition, Amendment No. 3, 4).

2.3. At the request of the consumer, pipes are equipped with couplings made according to , and at the rate of one coupling for each pipe.

(Changed edition, Amendment No. 3).

2.4. Cracks, spots, swellings and declines are not allowed on the surface of the pipes.

Delamination is not allowed at the ends of the pipes.

Individual dents, rippling, scratches, traces of stripping and other defects caused by the production method are allowed, if they do not take the wall thickness beyond the minimum dimensions, as well as a layer of scale that does not interfere with inspection.

On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the seam if there is a gentle thickening in this place along the inner diameter of no more than 1.0 mm.

(Changed edition, Amendment No. 3, 4).

(Changed edition, Amendment No. 2, 3, 4, 5, 6).

2.6. The ends of the pipes must be cut at right angles. The bevel of the end is allowed to be no more than 2°. The remaining burrs should not exceed 0.5 mm. When removing burrs, the formation of blunting (rounding) of the ends is allowed. It is allowed to cut pipes in the mill line.

By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, manufactured by furnace welding.

(Changed edition, Amendment No. 4, 6).

2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of pipes is allowed.

On the surface of galvanized pipes, bubbles and foreign inclusions (hardzinc, oxides, sintered mixture), and peeling of the coating from the base metal are not allowed.

Individual flux spots and traces of pipes being caught by lifting devices, roughness and minor local deposits of zinc are allowed.

It is allowed to correct individual non-galvanized areas on 0.5% of the outer surface of the pipe according to.

(Changed edition, Amendment No. 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf/cm 2) - pipes, ordinary and light;

3.1 MPa (32 kgf/cm 2) - reinforced pipes.

At the request of the consumer, the pipes must withstand hydraulic pressure of 4.9 MPa (50 kgf/cm2)

(Changed edition, Amendment No. 2, 3, 5).

2.9. Pipes with a nominal bore up to 40 mm inclusive must withstand the bend test around a mandrel with a radius equal to 2.5 outer diameters, and with a nominal bore of 50 mm - on a mandrel with a radius equal to 3.5 outer diameters.

At the request of the consumer, pipes must withstand the distribution test:

for pipes with a nominal bore from 15 to 50 mm - no less than 7%;

for pipes with a nominal bore of 65 or more - no less than 4%.

At the request of the consumer, pipes must withstand the flattening test to a distance between the flattened surfaces equal to 2/3 of the outer diameter of the pipes.

(Changed edition, Amendment No. 2, 3, 5).

2.10. At the request of the consumer, the mechanical properties of pipes for parts of water supply and gas pipeline structures must comply.

2.11. Pipe threads must be clean, without flaws or burrs and correspond to accuracy class B.

Pipes with cylindrical threads are used when assembling with seals.

2.10; 2.11. (Changed edition, Amendment No. 3, 4).

2.12. At the seam, blackness on the threads is allowed if the reduction in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.

(Changed edition, Amendment No. 2, 3, 5).

2.13. On a thread, it is allowed to reduce the useful length of the thread (without running) up to 15% compared to that indicated in the table. 4, and at the consumer’s request up to 10%.

(Changed edition, Amendment No. 2, 3, 5).

2.14. Threading on galvanized pipes is carried out after galvanizing.

2.15. (Deleted, Amendment No. 3).

2.16. At the request of the consumer, pipe welds are subjected to testing using non-destructive methods.

(Changed edition, Amendment No. 5).

3. ACCEPTANCE RULES

3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, the same brand and be accompanied by one document on quality in accordance with the addendum for pipes intended for the manufacture of parts for water supply and gas pipeline structures, made of steel according to: chemical composition and mechanical properties of steel in accordance with the document on the quality of the enterprise - the manufacturer of the workpiece.

The batch weight is no more than 60 tons.

(Changed edition, Amendment No. 3, 4).

3.2. Each pipe in the batch is subjected to inspection of the surface, dimensions and curvature.

It is allowed to use statistical control methods at a normal level. Control plans are established by agreement between the manufacturer and the consumer.

The outer diameter of the pipes is checked at a distance of at least 15 mm from the end of the pipe.

(Changed edition, Amendment No. 3, 4, 5).

3.3. To control the parameters of the thread, to test for expansion, flattening, bending, the height of the internal burr, the remains of burrs, the right angle and the chamfer angle (for pipes with beveled edges), mechanical properties, no more than 1%, but not less than two pipes from the batch are selected, and for pipes manufactured by continuous furnace welding - two pipes per batch.

(Changed edition, Amendment No. 3, 4).

3.4. All pipes are subject to weight control.

(Changed edition, Amendment No. 3).

(Changed edition, Amendment No. 6).

3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes from the batch are selected.

(Changed edition, Amendment No. 2).

3.7. If unsatisfactory test results are obtained for at least one of the indicators, a repeat test is carried out on a double sample.

The results of repeated tests apply to the entire batch.

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

The tensile test is carried out according to. Instead of tensile testing, it is allowed to control mechanical properties using non-destructive methods.

4.2. The surface of the pipes is inspected visually.

4.3. Hydraulic testing is carried out with exposure under test pressure for at least 5 s.

4.4. The bend test is carried out according to. Galvanized pipes are tested before coating.

(Changed edition, Amendment No. 3).

4.4a. The expansion test is carried out on a conical mandrel with a taper angle of 6°.

It is permissible to test on a mandrel with a taper angle of 30°.

(Changed edition, Amendment No. 3, 4).

4.4b. The flattening test is carried out according to.

(Changed edition, Amendment No. 3).

4.4v. Weld inspection is carried out using non-destructive methods according to regulatory and technical documentation.

(Introduced additionally, Amendment No. 3).

4.5. The thickness of the zinc coating on the outer surface and in accessible places on the inner surface is controlled by and, as well as by devices of the MT-41NTs, MTZON or Impulse type according to the normative and technical documentation.

4.6. The threads are checked using threaded ring gauges (third accuracy class).

In this case, the screw-in of the no-go ring gauge onto the thread should be no more than three turns.

(Changed edition, Amendment No. 3, 4).

4.7. The curvature of the pipes is controlled using a straight edge and a set of feelers according to TU 2-034-225-87.

(Changed edition, Amendment No. 3, 5).

4.8. The right angle of the pipe ends is controlled with a 90° square measuring 160x100 mm class 3, plate probes set 4 TU 2-034-225-87 or a protractor. The bevel angle of the chamfer is controlled using a protractor.

(Changed edition, Amendment No. 3, 6).

4.9. Control of the outer diameter is carried out with smooth micrometers according to , clamp gauges according to or .

The wall thickness, the height of the internal burr and the height of the burrs are measured with a micrometer or a wall gauge at both ends of the pipe.

The length of the pipes is measured using a tape measure. The thread is controlled by gauges.

There are special documents in accordance with which VGP steel water and gas pipes are produced. GOST 3262–75 is a standard for the production of goods for use in open areas, laying pipelines for work under pressure, pumping gas and liquids. The products are used in construction, housing, and agricultural production.

General information

Pipes for laying water and gas pipelines, technical requirements which are set out in regulatory documents, are targeted for their intended purpose. The differences between them lie in the production method. Regardless of the method used to produce VGP pipes, GOST 3262–75 defines all parameters and provisions of finished products, categories of certain types and directions of operation during economic activities.

According to the standard, water and gas pipes can be galvanized or non-galvanized. Finished goods come to the market in two forms:

with threaded ends;
with no thread.

Areas of use

Water and gas collectors are used in the production of repair and construction work. These products are used in the installation of gas and water communications, heating systems, are laid in public buildings, private buildings, multi-storey buildings, educational institutions, industrial and agricultural facilities.

According to GOST, pipes are produced in measured and unmeasured lengths; production according to customer sizes is allowed. Length provided standard sizes 4, 6 and 12 meters.

Wall thickness

This is the parameter by which types of water and gas pipes are distinguished. GOST divides them into types depending on weight:

In accordance with GOST, the product is produced with a nominal internal diameter of 10-65 mm, outside diameter is 16−74 mm. Specifications are determined according to standard standards, but the presence of cutting for threaded connection at the end of the pipes is determined by the customer.

The popularity of threaded products is explained by the fact that when installing pipes there is no need to weld, this reduces the cost of work and saves money.

GOST specifies that the error in the outer diameter should not exceed:

with precision production processing up to a size of 40 mm - 0.4−0.5%, over 40 mm - from 0.8 to 1%;
with increased release accuracy, pipe size up to 40 mm - 0.4%, over 40 mm - 0.8%;
weight deviation linear meter should not be more than 8%.

Production Features

The material is carbon steel. The production sequence consists of the main cycles:

In its final form, rolled products are treated with heat, this increases the strength of the product and resistance to destructive external factors, increases performance properties.

Galvanized steel water and gas pipes GOST 3262–75 are produced in the following accuracy groups:

ordinary accuracy - during their production, the chemical composition of the metal and its mechanical properties are not standardized, the use of products is limited to water supply, gas lines, and heating systems;
increased precision - these include steel pipes with zinc coating of specified parameters, used for parts of critical highways.

Threaded ends

The threads at the ends of pipes are cut or rolled during the production process for pipes with a wall thickness of more than 5 mm. It is taken into account that the internal and external diameters of the product change. The length of the threaded section and its application on one or two ends varies at the request of the customer. Products with galvanized coating weigh 3% more than those made of metal without the use of a protective layer. Technological requirements for the formed thread are determined:

Technical requirements for finished products

Standards and technological regulations are contained in GOST; manufacturers must not deviate from standard indicators. The following requirements apply to manufactured products:

Welded pipes

Welded pipes are produced by folding a metal sheet. The seam can be located along the pipe or formed in a spiral. Modern methods production make it possible to obtain the strength of the product at the weld site by only 7-12% less than the same indicator in the straight section. The requirements for water and gas pipes produced by welding are: ensuring quality in work:

Galvanized surfaces

The zinc coating protects the walls from corrosion by forming a film on the metal during oxidation. The layer prevents oxygen from penetrating deep into the metal and stops further destruction. The coverage requirements look like this:

Test standards

Typically, examination of the seam is done using x-rays. It is a mandatory step included in the quality control procedure. The weld seam is considered a place of increased risk of depressurization under load, but it is not considered a disadvantage. Control methods are regulated by technical requirements. The hydraulic test checks the pressure, withstands different types of pipes:

reinforced - 3.1 MPa or 32 KGS per cm 2;
light and ordinary - 2.4 MPa or 25 KGS per cm 2;
improved - 4.9 MPa or 50 KGS per cm2.

The bending test determines the possibility of bending without loss of properties. Products with a nominal bore of 40 mm allow 2.5, and pipes of 50 mm - 3.5 external diameter sizes.

The expansion test consists of accurately determining the strength of pipes or the durability of a seam in welded products. To do this, a section is cut out of the control pipe and checked. In this case, the distribution rate is:

for products 16−50 mm - no more than 7%;
for pipes larger than 65 mm - up to 4%.

Storage conditions

Special requirements are imposed on the packaging of VGP pipes only if they are external diameter is 6−20 mm. At the customer's request, products are rolled into coils. Galvanized goods are protected from water and stored securely. Metal pipes without anti-corrosion coating are stored fixed and only in dry rooms, ensuring that the humidity does not exceed permissible levels.

GOST 3262-75 is a regulatory document in accordance with which steel water and gas pipes are produced. Using pipes that, unlike plastic products, can be successfully operated in open areas, and carry out installation of pipelines for transporting liquid and gaseous media. Such steel pipes are practically irreplaceable in the field of capital and private construction, housing and communal services, and agriculture.

VGP steel pipes

General information about VGP steel pipes

Water and gas steel pipes, the parameters of which are determined by GOST 3262-75, are classified as products intended purpose, as their name suggests. The differences between their types lie primarily in the method of production. However, no matter what type the steel pipes of the category under consideration belong to, all their parameters are specified by the provisions of a document such as GOST 3262 (75, 80, 85, 91).

So, according to this standard (3262-75, latest edition 91st year), water and gas pipes made by welding can belong to one of the following types:

non-galvanized;
galvanized;
originally made with threads at the ends, which can be obtained by cutting or rolling;
without thread.

Each type of steel pipe is produced using a specific technology

Areas of application and individual parameters

The main areas of application of water and gas pipes are geometric parameters and whose technical characteristics comply with standard 3262-75 - construction and repair. Pipes of this category are used for arranging gas and water communications and heating systems in cottages and multi-apartment buildings, administrative buildings, educational institutions, agricultural, industrial and any other facilities.

So, this type of rolled metal is used in:

communications of cold and hot water supply;
heating systems;
gas pipeline networks.

GOST 3262 (75, 80, 85, 91) assumes that VGP welded pipes can be produced in dimensional, multiple dimensional and unmeasured lengths. So, according to this gradation, they have the following dimensions (according to the length of the manufactured products):

measured - from 4 to 12 m long;
having a length that is a multiple of the measured value;
unmeasured with a length within the limits of the measured value.

The standard length of pipes produced according to GOST is limited to 12 meters

Wall size is the criterion by which water and gas pipes are distinguished:

Reinforced VGP pipes are products (sometimes galvanized), the wall thickness of which is increased (accordingly, such products have more weight). They are used for installation of pipelines through which liquid or gaseous media are transported under high pressure.

If the technical characteristics and basic geometric parameters of water and gas pipes are regulated by a regulatory document, then the design option and cutting length are determined by the customer. Thus, the most popular are pipes whose ends are threaded during the production process. The reason for their high popularity is that they do not require welding to install them.

The use of pipes with ready-made threads significantly reduces the installation time for communications

Threads on VGP pipes can be created during their production:

rolling (a technology that allows you to obtain threads with the most accurate parameters, while it is assumed that the internal diameter of the pipe will be 10% smaller);
slicing.

The thread on VGP pipes is cut or rolled at the request of the customer, and it can be either short or long.

When calculating the weight of water and gas pipes, it should be borne in mind that galvanized products weigh 3% more than those made of ferrous metal. The standard also imposes a limitation on deviations in batch weight: they should not exceed 8%.

Technical requirements

An assortment of pipes of each type is formed, which lists their geometric parameters and theoretical weight.

Pipes are manufactured according to size and weight

The steel from which pipes of the VGP category are made must also meet the requirements specified in GOST (380, 1050), while the mechanical properties, as well as the chemical composition of the manufacturing material, are not standardized. Each type of pipe (welded, ferrous metal, galvanized, threaded) has special technical requirements, which should be discussed in more detail.

In accordance with the provisions of GOST, the following requirements are imposed on welded-type pipes of the VGP category.

If tubular products are connected using furnace welding technology, then in the area of the weld their outer diameter can be reduced by half a millimeter. If there is a gentle thickening on the inside of the seam, its size should not exceed 1 mm.
If using welding it is necessary to connect water and gas pipes whose wall thickness is more than 5 mm, then their ends must be chamfered at an angle of 35-40 degrees. In this case, the width of the end ring after chamfering should be in the range of 1–3 mm.
On the inside of the welded seam of water and gas pipes whose diameter exceeds 20 mm, excess metal must be cut or flattened so that its height does not exceed half a millimeter.
The customer can additionally specify the characteristics of products with an internal bore diameter of over 15 mm, produced using hot reduction (drawing) technology and joined by furnace welding. According to such requirements, a flat thickening may be present on the inside of the weld, the height of which is no more than 0.5 mm.

Straight seam welded pipes are produced by folding the sheet and then welding the side edges

Water and gas pipes, the threads at the ends of which are cut or rolled by the manufacturer, must have the following parameters.

The threads formed at the ends of water and gas pipes in the factory must correspond to accuracy category “B”. Its characteristics are specified by the provisions of GOST 6357. Thus, the thread must be clean, there cannot be any flaws or burrs on it.
At the joints and thread turns there may be blackness, and the height of the thread profile in such places should not be reduced by more than 15%. The customer has the right to set more stringent requirements, according to which the limit for reducing the height of the thread profile can be reduced to 10%.
The useful length of the thread (indicated in the assortment and measured without runoff) can be reduced to 15%, but the customer has the right to reduce the value of this deviation to 10%.

Thread requirements according to GOST

The zinc layer, which is applied to the entire surface of the water and gas pipe in the factory, must have a thickness of at least 30 microns. It is assumed that in areas with cut threads and at the ends there may be no zinc coating.
The zinc film must be applied with high quality; it must not contain bubbles, detachments from the base metal and foreign inclusions (oxides, sintered charge, zinc waste, etc.).
GOST allows the presence of flux stains, small deposits of zinc, roughness and marks on the surface of galvanized pipes that are left by elements of lifting devices.
If areas not coated with zinc are found on water and gas pipes, they can be re-treated, provided that the total area of such areas does not exceed 0.5% of the total surface area of the product.

VGP galvanized pipes

The customer can negotiate with the manufacturer the provision of GOST couplings (8944, 8954, 8965, 8966) - one coupling for each product.
On the surface of the pipes, defects such as swelling, sunsets, cracks, oxide film are excluded, and on the ends of the products - delamination.
There may be some defects on the surface of water and gas pipes that are caused by the production method (ripples, scratches, dents, traces of stripping). At the same time, such defects should not reduce the pipe wall thickness below the tolerance specified in the product range. A layer of scale may also be present, but it should not interfere with inspection of the product.
The ends of water and gas pipes supplied to consumers are cut at right angles. The bevel, if it occurs during pruning, should not exceed 2 degrees. The size of the burrs remaining after trimming should not exceed half a millimeter.

Pipes are checked for compliance with GOST selectively - at least two products from each batch are examined

The regulatory document also stipulates the control methods to which all pipes of the water and gas category must be subjected:

Hydraulic pressure test that pipes must withstand:

Ordinary and light type - 25 kgf/cm2 (2.4 MPa);

Reinforced - 32 kgf/cm2 (3.1 MPa);

Meeting special requirements - 50 kgf/cm2 (4.9 MPa).

Bend tests carried out on mandrels with a radius of:

– 2.5 outer diameter sizes – products with diameter up to 40 mm;

– 3.5 outer diameter sizes – pipes with DN 50 mm.

Distribution test for water and gas pipes with remote control:

– 15–50 mm – not less than 7%;

Labeling and storage conditions

By marking water and gas pipes, which must also comply with GOST, you can find out almost all the necessary information about the product: geometric dimensions, method of manufacture and processing, quality of the material. The number must be indicated at the end of the marking normative document, in accordance with which the product was manufactured.

Examples of symbols

Special packaging requirements VGP pipes are presented only if their outer diameter is from 6 to 20 mm. Such pipes, upon specific instructions from the customer, can be packaged in coils.

Depending on the type of water and gas pipes, their storage conditions may be as follows.

Galvanized products, which are characterized by increased resistance to the formation and development of corrosion, are securely fixed in storage areas and protected from direct moisture.
Water and gas pipes that are not coated with a protective layer of zinc must be stored in a fixed position in dry rooms with a minimum level of ambient humidity.

GOST 3262-75 Steel water and gas pipes: dimensions, characteristics

GOST 3262-75 and its requirements for steel water and gas pipes. Technical characteristics, scope and methods of quality control of VGP pipes.

Steel water and gas pipes technical specifications GOST 3262-75

STATE STANDARD OF THE USSR UNION

STEEL WATER AND GAS PIPES GOST

Specifications 3262-75

Water-supply and gas-supply steel pipes

Date of introduction 01.01.77

At the consumer's request, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in table. 2.

b) of unmeasured length.

Pipe wall thickness

Weight of 1 m of pipes, kg

Steel water and gas pipes technical specifications GOST 3262-75 - Document - page

Document - This standard applies to non-galvanized and galvanized steel welded pipes with cut or rolled cylindrical threads and without threads, used for water and gas pipelines, heating systems, as well as for

STATE STANDARD OF THE USSR UNION

Specifications Water-supply and gas-supply Specifications

Date of introduction: 01.01.77

(Changed edition, Amendment No. 2, 3, 5).

1. ASSORTMENT

1.1. Pipes are manufactured according to the dimensions and weight given in table. 1.

At the consumer's request, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in Table 2.

1.2. The length of the pipe is made from 4 to 12 m:

a) measured or multiple measured length with an allowance for each cut of 5 mm and a maximum deviation for the entire length plus 10 mm;

b) of unmeasured length.

By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of unmeasured pipes.

(Changed edition, Amendment No. 3, 4).

1. For threads made by rolling on a pipe, its internal diameter is allowed to be reduced by up to 10% along the entire length of the thread.

2. The mass of 1 m of pipes is calculated at a steel density of 7.85 g/cm 3 . Galvanized pipes are 3% heavier than non-galvanized ones.

(Changed edition, Amendment No. 1, 3)

1.3. Maximum deviations in pipe sizes should not exceed those indicated in the table. 3.

1. The maximum deviation in the positive direction for wall thickness is limited by the maximum deviations for the mass of the pipes.

1.4. Maximum deviations in the mass of pipes should not exceed + 8%.

At the request of the consumer, maximum deviations in mass should not exceed:

7.5% – for the party;

10% – for a separate pipe.

(Changed edition, Amendment No. 2, 5).

1.5. The curvature of pipes per 1 m length should not exceed:

2 mm – with nominal bore up to 20 mm inclusive;

1.5 mm – with a nominal bore over 20 mm.

1.6. Pipe threads can be long or short. The thread requirements must correspond to those indicated in the table. 4.

1.7. Pipes with a nominal bore of 6, 8, 10, 15 and 20 mm are wound into coils at the consumer’s request.

Examples of symbols

An ordinary pipe, non-galvanized, of normal manufacturing precision, of unmeasured length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without threads and without a coupling:

The same, measured length, with thread:

Pipe R-20×2.8 – 4000 GOST 3262-75

The same, with zinc coating, of unmeasured length, with thread:

The same, with zinc coating, custom length, with thread:

Pipe Ts-R-20×2.8 – 4000 GOST 3262-75

For pipes for rolling threads, the letter N is indicated in the symbol after the word “pipe”.

For pipes with long threads, the letter D is indicated after the word “pipe” in the symbol.

For pipes with increased manufacturing precision, the letter P is indicated in the symbol after the size of the nominal bore.

(Changed edition, Amendment No. 1).

2. TECHNICAL REQUIREMENTS

2.1. Pipes are manufactured in accordance with the requirements of this standard and according to technological regulations approved in the prescribed manner, from steels in accordance with GOST 380-88 and GOST 1050-88 without standardization of mechanical properties and chemical composition.

Pipes for parts of water supply and gas pipeline structures are made of steel in accordance with GOST 1050-88.

2.2. At the request of the consumer, the ends of pipes to be welded, with a wall thickness of 5 mm or more, must be chamfered at an angle of 35-40° to the end of the pipe. In this case, an end ring 1–3 mm wide should be left.

At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, threads are applied to both ends of the pipe.

2.1; 2.2. (Changed edition, Amendment No. 3, 4).

2.3. At the consumer's request, pipes are equipped with couplings manufactured in accordance with GOST 8944-75, GOST 8954-75, GOST 8965-75 and GOST 8966-75 at the rate of one coupling for each pipe.

(Changed edition, Amendment No. 3).

2.4. Cracks, spots, swellings and declines are not allowed on the surface of the pipes.

Delamination is not allowed at the ends of the pipes.

On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the seam if there is a gentle thickening in this place along the inner diameter of no more than 1.0 mm.

(Changed edition, Amendment No. 3, 4).

(Changed edition, Amendment No. 2, 3, 4, 5, 6).

By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, manufactured by furnace welding.

(Changed edition, Amendment No. 4, 6).

2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of pipes is allowed.

On the surface of galvanized pipes, bubbles and foreign inclusions (hardzinc, oxides, sintered mixture), and peeling of the coating from the base metal are not allowed.

Individual flux spots and traces of pipes being caught by lifting devices, roughness and minor local deposits of zinc are allowed.

It is allowed to correct individual non-galvanized areas on 0.5% of the outer surface of the pipe in accordance with GOST 9.307-89.

(Changed edition, Amendment No. 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf/cm 2) – pipes, ordinary and light;

3.1 MPa (32 kgf/cm 2) – reinforced pipes.

At the request of the consumer, the pipes must withstand hydraulic pressure of 4.9 MPa (50 kgf/cm2)

(Changed edition, Amendment No. 2, 3, 5).

At the request of the consumer, pipes must withstand the distribution test:

for pipes with a nominal bore from 15 to 50 mm - no less than 7%;

for pipes with a nominal bore of 65 or more - no less than 4%.

At the request of the consumer, pipes must withstand the flattening test to a distance between the flattened surfaces equal to 2/3 of the outer diameter of the pipes.

(Changed edition, Amendment No. 2, 3, 5).

2.10. At the request of the consumer, the mechanical properties of pipes for parts of water supply and gas pipeline structures must comply with GOST 1050-88.

2.11. Pipe threads must be clean, without flaws or burrs and comply with GOST 6357-81, accuracy class B.

Pipes with cylindrical threads are used when assembling with seals.

2.10; 2.11. (Changed edition, Amendment No. 3, 4).

2.12. At the seam, blackness on the threads is allowed if the reduction in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.

(Changed edition, Amendment No. 2, 3, 5).

2.13. On a thread, it is allowed to reduce the useful length of the thread (without running) up to 15% compared to that indicated in the table. 4, and at the consumer’s request up to 10%.

(Changed edition, Amendment No. 2, 3, 5).

2.14. Threading on galvanized pipes is carried out after galvanizing.

2.16. At the request of the consumer, pipe welds are subjected to testing using non-destructive methods.

(Changed edition, Amendment No. 5).

3. ACCEPTANCE RULES

3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, the same brand and be accompanied by one quality document in accordance with GOST 10692-80 with an addition for pipes intended for the manufacture of parts for water supply and gas pipeline structures, made of steel in accordance with GOST 1050-88: chemical composition and mechanical properties steel in accordance with the document on the quality of the billet manufacturer.

The batch weight is no more than 60 tons.

(Changed edition, Amendment No. 3, 4).

3.2. Each pipe in the batch is subjected to inspection of the surface, dimensions and curvature.

It is allowed to use statistical control methods in accordance with GOST 18242-72 with a normal level. Control plans are established by agreement between the manufacturer and the consumer.

The outer diameter of the pipes is checked at a distance of at least 15 mm from the end of the pipe.

(Changed edition, Amendment No. 3, 4, 5).

3.3. To control the parameters of the thread, to test for expansion, flattening, bending, the height of the internal burr, the remains of burrs, the right angle and the chamfer angle (for pipes with beveled edges), mechanical properties, no more than 1%, but not less than two pipes from the batch are selected, and for pipes manufactured by continuous furnace welding - two pipes per batch.

(Changed edition, Amendment No. 3, 4).

3.4. All pipes are subject to weight control.

(Changed edition, Amendment No. 3).

(Changed edition, Amendment No. 6).

3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes from the batch are selected.

(Changed edition, Amendment No. 2).

3.7. If unsatisfactory test results are obtained for at least one of the indicators, a repeat test is carried out on a double sample.

The results of repeated tests apply to the entire batch.

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

The tensile test is carried out according to GOST 10006-80. Instead of tensile testing, it is allowed to control mechanical properties using non-destructive methods.

4.2. The surface of the pipes is inspected visually.

4.3. Hydraulic testing is carried out in accordance with GOST 3845-75 with exposure under test pressure for at least 5 s.

4.4. The bend test is carried out according to GOST 3728-78. Galvanized pipes are tested before coating.

(Changed edition, Amendment No. 3).

4.4a. The expansion test is carried out according to GOST 8694-75 on a conical mandrel with a cone angle of 6°.

It is permissible to test on a mandrel with a taper angle of 30°.

(Changed edition, Amendment No. 3, 4).

4.4b. The flattening test is carried out according to GOST 8695-75.

(Changed edition, Amendment No. 3).

4.4v. Weld inspection is carried out using non-destructive methods according to regulatory and technical documentation.

(Introduced additionally, Amendment No. 3).

4.5. The thickness of the zinc coating on the outer surface and in accessible places on the inner surface is controlled according to GOST 9.301-86 and GOST 9.302-88, as well as with devices of the MT-41NTs, MTZON or Impulse type according to the normative and technical documentation.

4.6. The thread is checked using thread ring gauges in accordance with GOST 2533-88 (third accuracy class).

In this case, the screw-in of the no-go ring gauge onto the thread should be no more than three turns.

(Changed edition, Amendment No. 3, 4).

4.7. The curvature of the pipes is controlled using a straight edge in accordance with GOST 8026-92 and a set of probes in accordance with TU 2-034-225-87.

(Changed edition, Amendment No. 3, 5).

4.8. The right angle of the pipe ends is controlled with a 90° square measuring 160x100 mm, class 3 GOST 3749-77, plate probes set 4 TU 2-034-225-87 or an inclinometer GOST 5378-88. The bevel angle of the chamfer is controlled with a protractor according to GOST 5378-88.

(Changed edition, Amendment No. 3, 6).

4.9. The outer diameter is checked using smooth micrometers in accordance with GOST 6507-90, clamp gauges in accordance with GOST 2216-84 or GOST 18360-93.

The wall thickness, the height of the internal burr and the height of the burrs are measured with a micrometer according to GOST 6507-90 or a wall gauge according to GOST 11358-89 at both ends of the pipe.

The length of the pipes is measured with a tape measure according to GOST 7502-98. Threads are controlled with gauges in accordance with GOST 2533-88.

The mass of a batch of pipes is controlled on scales of no more than 10 tons with a division value of no more than 20 kg.

(Changed edition, Amendment No. 3, 4, 5, 6).

4.10. Weld inspection is carried out using non-destructive methods according to technical documentation.

(Introduced additionally, Amendment No. 4).

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Labeling, packaging, transportation and storage are carried out in accordance with GOST 10692-80 with addition.

5.1.1. Pipe threads must be protected from mechanical damage and corrosion by lubricant according to the regulatory and technical documentation.

Sec. 5. (Changed edition, Amendment No. 3).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR Ministry of Ferrous Metallurgy

V. I. Struzhok, Ph.D. tech. sciences, V. M. Vorona, Ph.D. tech. sciences, Yu. M. Mironov, Ph.D. tech. nook, A. I. Postolova

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Standards dated 09.11.75 No. 2379

3. Inspection frequency 5 years

4. INSTEAD GOST 3262-62

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

6. Reissue (May 1994) with Amendments No. 1, 2, 3, 4, 5, 6, approved in November 1977, December 1978, January 1987, May 1988, November 1989. , November 1991 (IUS 1-78, 2-79, 4-87, 8-88, 2-90, 2-92)

Sections

Steel water and gas pipes. Steel water and gas pipes Water and gas pipes GOST 3262 85

1. ASSORTMENT

Dimensions, mm

2. TECHNICAL REQUIREMENTS

3. ACCEPTANCE RULES

4. TEST METHODS

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

INFORMATION DATA

STEEL WATER AND GAS PIPES GOST 3262-75

1. ASSORTMENT

2. TECHNICAL REQUIREMENTS

3. ACCEPTANCE RULES

4. TEST METHODS

General information

Areas of use

Wall thickness

Production Features

Threaded ends

Technical requirements for finished products

Welded pipes

Galvanized surfaces

Test standards

Storage conditions

General information about VGP steel pipes

Areas of application and individual parameters

Technical requirements

Labeling and storage conditions

Steel water and gas pipes technical specifications GOST 3262-75

STATE STANDARD OF THE USSR UNION

1. ASSORTMENT

2. TECHNICAL REQUIREMENTS

3. ACCEPTANCE RULES

4. TEST METHODS

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

INFORMATION DATA

STEEL WATER AND GAS PIPES
GOST 3262-75